01 a. Viewing all around, or on all sides.
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1.
Viewing all around, or on all sides.
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2.
of or relating to a periscope{2}.
Phrases & compounds
Periscopic spectacles —
spectacles having concavo-convex or convexo-concave lenses with a considerable curvature corresponding to that of the eye, to increase the distinctness of objects viewed obliquely.